STINNER Victor added the comment:

> It adds extract_tb_ex() and extract_stack_ex() functions ...

I don't like "_ex" suffixes, it's not future proof if we need to add another 
function later.

You may rename them using "_iter" suffix and return an iterator instead of a 
list. Such idea was also proposed for os.listdir() => os.scandir() / 
os.iterdir(). See the discussion in #11406. The caller can write 
tuple(extract_stack_iter()), as I do with dict.items() to sort a dictionary.

> Feedback?

I like unit tests :-) The patch should also document new functions.
You may only need the most recent frames.

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nosy: +haypo

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<http://bugs.python.org/issue19146>
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